Staring into a crystal ball is a dangerous undertaking, especially when you’re attempting to predict the future of a market as dynamic as paid search. Leading analysts continue to project that paid search marketing spend in the U.S. will grow from $13 billion in 2009 to $26 billion by the year 2014. But how this growth will happen remains unclear. One thing is certain, as more dollars flow into paid search, the number of tactics, targeting options and channels available for search marketers will need to grow to ensure that search campaigns can deliver ever-increasing ROI. Here are five predictions for macro-trends that will fuel the next phase of paid search growth.